A team has finished a game with 20-20-3 runs-hits-errors line 2 times since 1897, most recently Minnesota Twins on 22 August 2014. That is about one every 221,502 team-games.
Box score for the most recent one ↗
20-18-1 20-18-2 20-19-0 20-19-2 20-19-1 20-19-5 20-20-3 20-20-2 20-20-1 20-20-0 20-21-2 20-21-5 20-21-1
The whole distribution — Runs-Hits-Errors Lines · All 18 shapes